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Collateralized Transactions (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Securities received as collateral:    
Securities borrowed $ 1,739,045 $ 1,665,860
Securities purchased under agreements to resell 502,470 1,512,114
Securities received as collateral 2,241,515 3,177,974
Pledged    
Securities received as collateral:    
Financial instruments owned 1,449,054 1,230,859
Equities | Pledged    
Securities received as collateral:    
Financial instruments owned 1,441,851 1,222,559
Exchange traded notes | Pledged    
Securities received as collateral:    
Financial instruments owned $ 7,203 $ 8,300